Use After Free Affecting python3-perf package, versions <0:4.18.0-553.22.1.el8_10

Note: Versions mentioned in the description apply only to the upstream python3-perf package and not the python3-perf package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

watchdog: Fix possible use-after-free by calling del_timer_sync()

This driver's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.

• https://access.redhat.com/security/cve/CVE-2021-47321
• https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3
• https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e
• https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d
• https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4
• https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270
• https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f
• https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf
• https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111
• https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a